Cyanobacteria can benefit from freshwater salinization following the collapse of dominant phytoplankton competitors and zooplankton herbivores

Freshwater Biology, Journal Year: 2024, Volume and Issue: 69(12), P. 1748 - 1759

Published: Oct. 22, 2024

Abstract Freshwater salinization is an increasing threat to lakes worldwide, but despite being a widespread issue, little known about its impact on biological communities at the base of food chain. Here we used mesocosm set‐up coupled with modern high‐frequency sensor technology identify short‐ and longer‐term responses phytoplankton in oligotrophic lake. We tested effects over gradient salt concentrations that can be found natural exposed road contamination (added range: from 0 1500 mg Cl − L −1 ). The chlorophyll‐ (chl‐ ) fluorescence measurements showed divergence chl‐ along time, substantially lower higher levels. At sub‐daily scale, profound suppression day–night signal cycles salinity, which could related physiological stress due impairment photosynthesis via photosystem II or potential changes active migration phytoplankton. Community analyses revealed similar decline pattern for total biomass collapse zooplankton biomass. Interestingly, loss diversity compositional re‐organization involving dominant green algae increased salt‐tolerant cyanobacteria. Altogether, these results suggest specific cyanobacterial taxa benefit freshwater following competitors herbivores. also highlight value autonomous capture novel, small‐scale ecological salinization, thereby track fast primary producer communities.

Language: Английский

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Response of Phytoplankton Communities to Variation in Salinity in a Small Mediterranean Coastal Lagoon: Future Management and Foreseen Climate Change Consequences

Water, Journal Year: 2023, Volume and Issue: 15(18), P. 3214 - 3214

Published: Sept. 9, 2023

Mediterranean coastal lagoons are particularly vulnerable to increasing direct anthropogenic threats and climate change. Understanding their potential responses global local changes is essential develop management strategies adapted these ecosystems. Salinity a fundamental structuring factor for phytoplankton communities; however, its role under change understudied. We hypothesized that salinity variations imposed by and/or actions could disturb lagoons’ communities. To test our hypothesis, we performed two 5-day microcosm experiments in which natural assemblages from the Santa Giulia lagoon (Corsica Island) were subjected three (53–63–73) decreasing (33–26–20) levels of salinity, mimic strong evaporation flash flooding, respectively. Results indicate over-salinization inhibited growth modified assemblages’ composition. Freshening, on contrary, showed feeble effects, mainly boosting microphytoplankton abundance depleting diversity at lowest salinity. In both freshening particular, initially rare species emerged, while photosynthetic activity was degraded increase only. demonstrated communities’ structure metabolism strongly altered predicted implications Such impacts have be considered future (control sea exchanges watershed fluxes). This work constitutes priority step towards proactive conservation such as-yet-neglected ecosystems context

Language: Английский

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Road salt pollution alters sex ratios in emerging mosquito populations

Environmental Pollution, Journal Year: 2023, Volume and Issue: 334, P. 122203 - 122203

Published: July 13, 2023

Language: Английский

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Assembly mechanisms of microbial communities in plastisphere related to species taxonomic types and habitat niches

Marine Pollution Bulletin, Journal Year: 2023, Volume and Issue: 198, P. 115894 - 115894

Published: Dec. 14, 2023

Language: Английский

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Road Salt versus Urban Snow Effects on Lake Microbial Communities

Microorganisms, Journal Year: 2022, Volume and Issue: 10(4), P. 803 - 803

Published: April 12, 2022

Freshwater salinization is an ongoing concern for north temperate lakes; however, little known about its impacts on microbial communities, particularly bacteria. We tested the hypotheses that road de-icing salt induces changes in community structure of lake plankton, and due to chloride would differ from those urban snowmelt because additional chemicals snowmelt. In a laboratory incubator experiment, overwintering plankton water was exposed two weeks either NaCl or municipal snow with same level chloride. Microbial as determined by 16S (prokaryotes) 18S (eukaryotes) rRNA transcript analysis showed response chloride-only enrichment, some rare taxa becoming more prominent. Consistent our hypothesis, treatments induced different changes. These results indicate ecotoxicology assays based single addition may not reflect situ effects salt-contaminated snow, combined chemical require direct testing.

Language: Английский

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Response of Prokaryotic Communities to Freshwater Salinization

Applied Microbiology, Journal Year: 2022, Volume and Issue: 2(2), P. 330 - 346

Published: May 19, 2022

Each year, millions of tons sodium chloride are dumped on roads, contributing to the salinization freshwater environments. Thus, we sought understand effect (NaCl) lake prokaryotic communities, an important and understudied component food webs. Using mesocosms with 0.01–2.74 ppt NaCl (0.27–1110.86 mg/L Cl−), evaluated generated diversity absolute abundance populations after three six weeks. A positive relationship between Cl− values bacterial was found The influence eukaryotic variation observed as well. Significant differentiation communities starting at 420 weeks, levels lower than Canadian US recommendations for acute exposure. partial recovery a “pre-disturbance” community following drop in salinity threshold level Cl−. gradual transition dominance from Betaproteobacteria Actinobacteria Bacteroidia Alphaproteobacteria is overall similar natural estuaries.

Language: Английский

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Impacts of salinity stress induced by ballast water discharge on the ecosystem of shanghai port, China

Marine Environmental Research, Journal Year: 2024, Volume and Issue: 200, P. 106629 - 106629

Published: July 2, 2024

Language: Английский

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Eco‐phenotypic feedback loops differ in multistressor environments

Ecology, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 26, 2024

Abstract Natural communities are exposed to multiple environmental stressors, which simultaneously impact the population and trait dynamics of species embedded within these communities. Given that certain traits, such as body size, known rapidly respond change, given they can strongly influence density populations, this raises question whether strength eco‐phenotypic feedback loop depends on environment, stressful environments would enhance or disrupt causal linkage. We use two competing freshwater ciliates— Colpidium striatum Paramecium aurelia —and expose their populations a full‐factorial design increasing salinity temperature conditions well interspecific competition. found salinity, temperature, competition significantly affected cell size both species. Cell influenced dynamics; however, weakened in with Our study highlights importance studying different comprising abiotic interactions.

Language: Английский

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Interview with the Editors: Limnology and Oceanography Letters Special Issue on Salinization of Freshwater Ecosystems

Limnology and Oceanography Bulletin, Journal Year: 2023, Volume and Issue: 32(2), P. 69 - 71

Published: April 4, 2023

Language: Английский

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Road Salt Pollution Alters Sex Ratios in Emerging Mosquito Populations

Published: Jan. 1, 2023

Temperate cities that are exposed to ice and snow also experience high de-icing road salt use during the winter. When salts runoff into freshwater environments, they can decimate ecological communities by wiping out salt-intolerant taxa promoting salt-tolerant taxa. One of concern mosquitoes, which act as potential zoonotic disease vectors. While increased mosquito abundance lead higher transmission risk for urban residents, sexual dimorphism means only female mosquitoes transmit diseases like West Nile Virus (WNV); adult females require bloodmeals from their hosts reproduce. Interestingly, many species display male-biased emergence sex ratios, may be exacerbated prolonged exposure aquatic stressors larval development. Yet, little is known about how common stressors, in cold regions, affect ratios emergent across a season. Because vulnerability juvenile development compared smaller, often faster developing males, we hypothesized stressful conditions (salinity) will reduce success shift more male-biased. We manipulated concentrations (0 g/L or 4.5 g/L) 10 mesocosms Mississauga, Canada WNV season (May October). measured ratio collecting adults traps weekly. found female-biased both control treatments show significantly towards parity (50:50) response (Negative Binomial Model; Estimate ± SE = 0.283 0.108;P 0.009). By showing toward male emerging salinity treatments, our results suggest have decrease indirectly cities.

Language: Английский

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